打印并访问List< String []> [英] Print and access List <String[]>

问题描述

我正在读取文件并将其存储在t1中。如何访问t1中的元素？当我尝试打印它时，我得到地址而不是值。还有 String 和 String [] 之间的区别？

I'm reading in a file and storing it in t1. How do I access the elements in t1? When I try to print it I get addresses instead of values. Also whats the difference between String and String[]?

        CSVReader reader = new CSVReader(new FileReader("src/new_acquisitions.csv"));
        List <String[]> t1 = reader.readAll();

        int i = 0
        while(i < t1.size()) {
          System.out.println(t1.get(i));
          i++;
        }

输出：

[Ljava.lang.String;@9304b1
[Ljava.lang.String;@190d11
[Ljava.lang.String;@a90653
[Ljava.lang.String;@de6ced

推荐答案

String []是一个字符串数组，因此它没有像你期望的那样打印，请尝试：

String[] is an array of strings, hence the reason it is not printing as you would expect, try:

for (int i = 0; i < t1.size(); i++) {
    String[] strings = t1.get(i);
    for (int j = 0; j < strings.length; j++) {
        System.out.print(strings[j] + " ");
    }
    System.out.println();
}

或更简洁：

for (String[] strings : t1) {
    for (String s : strings) {
        System.out.print(s + " ");
    }
    System.out.println();
}

或更好：

for (String[] strings : t1) {
    System.out.println(Arrays.toString(strings));
}

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